Astronomy and Astrophysics – Astronomy
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978icar...34..344f&link_type=abstract
Icarus, vol. 34, May 1978, p. 344-354.
Astronomy and Astrophysics
Astronomy
18
Abundance, Astronomical Spectroscopy, Germanium Compounds, Hydrogen Compounds, Infrared Spectra, Jupiter Atmosphere, Airborne Equipment, Infrared Astronomy, Infrared Spectroscopy, Water Vapor, Germane, Jupiter, Atmosphere, Spectrum, Analysis, Concentrations
Scientific paper
Germane, GeH4, is a tetrahedral molecule like methane. The nu 3 fundamental mode of GeH4 falls in the middle of the 5-micrometer Jupiter window. Jupiter observations were made in December 1975 during three flights with the 0.9-m telescope of the Kuiper Airborne Observatory. The spectrometer is a rapid-scanning Michelson interferometer having InSb detectors at each of the two outputs. The germane identification procedure is based on a comparison of the obtained Jupiter spectrum with that of laboratory germane. It appears that the detection of GeH4 in Jupiter's atmosphere with a mixing ratio of 0.6 ppb is the smallest concentration of a trace constituent yet detected in a nonterrestrial planetary atmosphere. It is pointed out that a strict interpretation of thermochemical equilibrium predictions for the spectral line forming regions of Jupiter's atmosphere does not explain the observation of GeH4.
Fink Uwe
Larson Harold P.
Treffers Richard R.
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